In order to estimate the spatial covariance structure of sea surface temperature (SST) using Advanced Very High Resolution Radiometer (AVHRR) satellite data, autocorrelation induced by the sensor itself must be determined and then removed before the correlative properties of SST per se can be found. Procedures for removing this sensor-induced correlation are presented. Oceanographically, these results indicate, for example, that the gradients associated with sharp oceanic fronts will be suppressed. -from Author